Complexe de conservation de l’Amazonie centrale

Brève description

Complexe de conservation de l’Amazonie centrale © Public Domain

Justification d'inscription

Critère (ii): Ensemble, les forêts de varzea et d’igapó, les lacs, les rivières et les îles du site proposé constituent des formations physiques et biologiques et illustrent des processus écologiques en cours du point de vue de l’évolution des écosystèmes terrestres et d’eau douce. On y trouve une mosaïque de bras de rivières, lacs et formes de relief qui change et évolue constamment. Les tapis flottants (en mouvement permanent et en évolution constante) de végétation typique des cours d’eau à varzea comprennent un nombre important d’espèces endémiques, y compris la plus grande diversité de poissons électriques du monde. Anavilhanas contient le deuxième archipel fluvial de l’Amazonie brésilienne par la taille. Beaucoup mieux préservé que l’archipel légèrement plus grand de Maricua, il illustre des processus de colonisation et d’évolution de la végétation sur de nouvelles formes de relief. L’UICN considère que le site proposé remplit ce critère.

Critère (iv): Le site agrandi augmente de manière substantielle la protection déjà exceptionnelle offerte par le Parc national Jaú à la diversité biologique, aux habitats et aux espèces en danger que l’on trouve dans la région centrale de l’Amazonie. Le site proposé est une des Zones mondiales pour les oiseaux endémiques et il est considéré comme l’une des 200 écorégions prioritaires du WWF pour la conservation. C’est aussi un centre de diversité des plantes. L’agrandissement du Parc national Jaú afin d’inclure un échantillon important d’écosystèmes de Varzea, de forêts d’igapó, de lacs et de canaux augmente de manière significative la représentation de la biodiversité aquatique de la région d’Amazonie centrale. L’agrandissement du site renforcerait aussi la protection d’espèces menacées clés telles que l’arapaima géant, le lamantin de l’Amazone, le caïman noir et deux espèces de dauphins fluviatiles. L’UICN considère que le site proposé remplit ce critère.

Description longue

The Central Amazon Conservation Complex makes up the largest protected area in the Amazon Basin (over 6 million hectares) and is one of the planet's richest regions in terms of biodiversity.

The site is made up of Jaú National Park, Demonstration area of Mamairauá Sustainable Development Reserve, Amanã Sustainable Development Reserve and the Anavilhanas Ecological Station located in Amazonas State  The site includes an important sample of annually flooded (várzea) ecosystems, igapó forests, lakes and channels which take the form of a constantly evolving aquatic mosaic that is home to the largest array of electric fish in the world.

The rivers provide a landscape of white-sand beaches during the dry season and flooded forest during the wet season, as well as secondary stream beds of distinct sizes, channels, paranás and an important fluvial phenomenon, the ria lake, which is typical of all large rivers in the Amazon region. The site contains the nine-tier waterfall of the Carabinani River, and also includes a significant proportion of the black-water drainage system, the headwaters of which are located primarily in the Guiane Shield. Its dark colour results from organic acids released into the water through the decomposition of organic matter and the lack of terrestrial sediments.

The forest cover is linked to the extensive and continuous forests of the Amazon Central Plain. It encompasses a landscape, which is characteristic of the lower Negro River and was typified as follows: dense tropical forest, located primarily on terra firme, thereby free from inundation in the flooding season; open tropical forest, apparently associated with the physiognomy of tropical forests and areas of ecological tension, such as wide soil and climatic transitions between two distinct geobotanical zones; and Campinarana, a vegetation mosaic restricted to the Negro River watershed, occupying primarily upland regions and drained by tabular watercourses.

The park protects an impressive sample of fauna, with many species associated to black-water river systems. There is a high diversity of vertebrates with 120 species of mammals, 411 birds, 15 reptiles and 320 fishes. Numerous species of conservation concern live within the park, including jaguar, giant otter, Amazonian manatee, South American river turtle and black caiman. The importance of the site for Amazon fauna is reflected in the fact that it contains approximately 60% of the species of fish reported to exist in the Negro River watershed, and also 60% of the birds recorded from the Central Amazon.

The site is home to relics of past human occupation of the Amazon region. A recent survey identified 17 archaeological sites at the mouth of the Negro River, with collected material as of yet undated, suggesting that the area may have been a passageway between the Solimoes and Negro watersheds and representative of ethnic groups present in these two regions. Numerous stone carvings are found on the river's edge, reinforcing the potential for archaeological research.

Notes

• Extension du bien « Parc national Jaú ».